netdev - Re: [Intel-wired-lan] [REGRESSION] e1000e probe/link detection fails since 6.2 kernel

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Date:   Sun, 2 Apr 2023 10:38:10 +0300
From:   "Neftin, Sasha" <sasha.neftin@...el.com>
To:     Takashi Iwai <tiwai@...e.de>, Jakub Kicinski <kuba@...nel.org>
CC:     Bagas Sanjaya <bagasdotme@...il.com>,
        Paul Menzel <pmenzel@...gen.mpg.de>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        <netdev@...r.kernel.org>, <intel-wired-lan@...ts.osuosl.org>,
        <regressions@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
        "Ruinskiy, Dima" <dima.ruinskiy@...el.com>,
        "Avivi, Amir" <amir.avivi@...el.com>,
        "Meir, NaamaX" <naamax.meir@...el.com>,
        "Neftin, Sasha" <sasha.neftin@...el.com>,
        "Lifshits, Vitaly" <vitaly.lifshits@...el.com>
Subject: Re: [Intel-wired-lan] [REGRESSION] e1000e probe/link detection fails
 since 6.2 kernel

On 3/30/2023 13:35, Takashi Iwai wrote:
> On Thu, 30 Mar 2023 08:30:17 +0200,
> Takashi Iwai wrote:
>>
>> On Wed, 29 Mar 2023 21:12:32 +0200,
>> Jakub Kicinski wrote:
>>>
>>> On Wed, 29 Mar 2023 10:48:36 +0200 Takashi Iwai wrote:
>>>> On Wed, 29 Mar 2023 10:40:44 +0200,
>>>> Bagas Sanjaya wrote:
>>>>>
>>>>> On Tue, Mar 28, 2023 at 04:39:01PM +0200, Paul Menzel wrote:
>>>>>> Does openSUSE Tumbleweed make it easy to bisect the regression at least on
>>>>>> “rc level”? It be great if narrow it more down, so we know it for example
>>>>>> regressed in 6.2-rc7.
>>>>>>    
>>>>>
>>>>> Alternatively, can you do bisection using kernel sources from Linus's
>>>>> tree (git required)?
>>>>
>>>> That'll be a last resort, if no one has idea at all :)
>>>
>>> I had a quick look yesterday, there's only ~6 or so commits to e1000e.
>>> Should be a fairly quick bisection, hopefully?
>>
>> *IFF* it's an e1000e-specific bug, right?
>>
>> Through a quick glance, the only significant change in e1000e is the
>> commit 1060707e3809
>>      ptp: introduce helpers to adjust by scaled parts per million
>>
>> Others are only for MTP/ADP and new devices, which must be irrelevant.
>> The tracing must be irrelevant, and the kmap change must be OK.
>>
>> Can 1060707e3809 be the cause of such a bug?
> 
> The bug reporter updated the entry and informed that this can be
> false-positive; the problem could be triggered with the older kernel
> out of sudden.  So he closed the bug as WORKSFORME.
> 
> #regzbot invalid: Problems likely not in kernel changes
I do not think the problem is with the kernel/SW/driver code. "Failed to 
disable ULP" (ultra-low power disabling)line in a dmesg log can indicate 
that the PHY of the LAN controller is inaccessible. Probably your laptop 
has an _LM SKU (CSME/AMT)of LAN controller (with manageability).
Unfortunately, we haven't had the reliable opportunity to interact with 
the CSME/AMT. Moreover, access to the PHY when CSME/AMT controls it 
could put the LAN controller in an unknown state.
This model of the laptop is no longer supported thought. Worth checking 
the option to disable CSME/AMT via BIOS.

So, somehow it worked previously. _V SKU should not hit on such a problem.
> 
> 
> thanks,
> 
> Takashi